Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1996-07-12
1999-08-24
Elms, Richard T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
H01H 4700
Patent
active
059428139
ABSTRACT:
A switching circuit (3) having a low component count and suitable for use with a nuclear event detector circuit (2) provides a means for isolating a power source (1) from a load (2, 4). A bipolar transistor (5) provides a temperature insensitive, low voltage drop supply to the load (2, 4) and a MOSFET (7) provides base current to the bipolar transistor during standby mode; the MOSFET being turned on by the supply (1). When the supply voltage drops below the threshold voltage of the MOSFET (7), the base bias to the bipolar transistor (5) is removed. The bipolar transistor (5) cannot therefore conduct in the reverse sense and the circuit provides true isolation for the power supply (1) and the load (2, 4).
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Elms Richard T.
Matra BAe Dynamics (UK) Ltd.
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